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T. E. LITTLE.

Millstone Exhaust.

Patented Feb. 1858.

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THOS. E. LITTLE, OF JANESVILLE, WISCONSIN.

SCRAPER FOR GRINDING-MILLS.

Specification of Letters Patent No. 19,302, dated February '9', 1858.

To all whom it may concern:

Be it known that I, THOMAS E. LITTLE, of J anesville, in the county of Rock and State of Visconsin, have invented a new and useful Improvement in Grinding Mills; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in which Figure 1, is a vertical central section of my improvement applied to a pair of mill stones, the runner or upper stone being removed. Fig. 2, is a detached inverted plan of ditto.

Similar letters of reference indicate cor-- responding parts in the two figures.

The object of this invention is to keep an unobstructed space all around the runner or upper stone between it and the curb, so that the meal will be allowed to escape freely from between the stones, the process of grinding expedited considerably and the meal kept in a much cooler state than usual.

The invention consists in having a series of scrapers attached to a rotating head placed on the curb. The scrapers being fitted in the space between the curb and runner and, as they pass around within the space, clearing or scraping the ground meal, as it escapes from between the stones, into the discharge spout.

To enable those skilled in the art to fully understand and construct my invention I will proceed to describe it.

A represents a stationary or bed stone the upper surface of which projects a short distance above the upper surface of the bed B in which it is fitted as usual. The runner or upper stone, not shown, is arranged in the ordinary way directly over the stone A.

C is the curb which may be constructed of wood or sheet metal and placed around the runner or upper stone, the curb resting upon the bed B as usual and a short distance from the edges of the runner and bed stone so as to leave a space (a). The upper part or head (6) of the curb is not attached to the curb as usual but it projects a certain distance over or beyond the curb C and has an annular way (0) attached to it. This way rests upon friction rollers (03) any proper number being used, said friction rollers be ing secured to the upper part of a circular frame D which encompasses the curb. The under surface of the head (5) nearly touches the top edge of the curb C.

To the under surface of the head (6) rods (6) are attached, said rods being within the curb C and having blades or scrapers (f) attached to their lower ends. The lower edges of these blades or scrapers just clear the surface of the bed B and they are nearly equal in width to the space (a). On the head (5) a geared rim (9) is secured into which rim a pinion meshes. This pinion is placed on the upper part of a vertical shaft B, which extends below the bed B, power being applied to the lower end of the shaft in any proper manner.

F is the discharge spout through which the meal escapes into the elevator box or into any proper receptacle prepared to re ceive it.

Then the mill is in operation, the runner or upper stone rotates as usual and the meal escapes from between the stones at all points around them into the space (a) and the head (6) being rotated by means of the gearing (g) the scrapers (f) in passing around within said space scrape the meal into the discharge spout F. In the old plan the space (a) is allowed to fill up with meal and the meal is carried around to the discharge passage F by the rotation of the runner or upper stone. It will at once be seen that by this means the discharge of meal is much obstructed and the rapidity of the work considerably retarded; the meal also is liable to be heated as there is but little or no draft passing between the stones.

Having thus described my invention, what I claim as new and desire to secure by Let ters Patent, is

The employment of the rotating head 1)), having rods (6) and scrapers attached; said parts being arranged to revolve slowly around the runner, at whatever speed the latter may be driven, substantially as and for the purposes set forth.

THOMAS E. LITTLE.

VVit-nesses J. M. TULLMAN, S. A. HUDSON. 

